in MENU, you will need to activate it in the TIME, ALTI & BARO or COMPASS mode

before entering MENU. The backlight will then be activated until you exit MENU.

en

 

NOTE: Heavy use of the backlight will significantly reduce battery life.

4.6 Activating button lock

You can activate and deactivate the button lock by keeping [Down Light] pressed down. When the button lock is activated, it is indicated with a lock symbol.

NOTE: You can change views and use the backlight when the button lock is activated.

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Suunto LUMI manual Activating button lock